The ammeter must be in series with the neg. The diagram doesn't show that. One meter lead to the battery post and the other lead to the neg cable.
And yes, it must be a high current DC ammeter (~ 10amps). Most multimeters don't have this DC current capacity.
Ron, now may be a good time to make up your own fuse diagram. I'm sure it will be similar to a late car. Get the diagram from panteraplace.com and pull 1 fuse at a time (with key on) to compare it to the 74 schematic.
Will
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